i don´t thinky you can find anywhere in the rule what the perfect height is for a player being trained in a certain position... This is one off these hidden stats. From what I understand (I might be wrong, but I am sure someone will correct me if I am) a 6´9 guard will train faster than a 7´3 guard. How much or slower noone knows. Looking at the guard that I have that is too tall, in 1 season he is lagging 1 to 2 skills pop behind. It is only 1 season, so I could have been unhappy with the pops. However, too give you my opinion, I will never buy a player again that is small or too tall for his training position.